Troubleshooting - Graco PD44 Setup & Operation

Troubleshooting

Follow Pressure Relief Procedure, page 23, before
checking or repairing the control box.
Problem
Dispense valve stalling and no
material being dispensed despite
adequate input pressure.
Dispense valve not discharging
normal or full volume.
Material leaks past spool valves.
Improper material mixing.
Material leaks around mixer while
dispensing.
313877J
Cause
Blocked mixer
Flow control valve closed
Low material level in reservoirs
Air in material tanks
Spool valve worn or damaged
Mixer not clean or free
Cured material in mixer
Troubleshooting
Solution
Check mixer for cured material,
replace mixer as required
Open
Fill material reservoirs and prime the
machine
Fill reservoirs and prime machine
Replace the spool valve and sleeve
Remove and replace the mixer
Check mixer for cured material,
replace mixer
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